Car-brake



(No Model.)

D. HOIT.

OAR BRAKE.

Patented Nov. 11, 1884.

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DAVID HOIT, OF VEST ALBANY, ASSIGNOR OF ONE-HALF TO CHARLES R. HICKS, OF TROY, NEW YORK.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 307,946, dated November 11, 1884.

(No model.)

To all whom it may concern:

Be it known that I, DAVID HOIT, of West Albany, in the county of Albany and State of New York, have'invented certain new and useful Improvements in Oar-Brakes, of which the following is a full and exact description, reference being had to the accompanying drawings, which form part of this specification, and in which- Figure 1 is a longitudinal section of a cartruck provided with my improved brake mechanism; Fig. 2, a side elevation of the same with parts of the frame-work broken away to expose the underlying parts, and Fig. 3 a transverse section of the same.

My invention consists of a novel arrangement'of the brake-shoes between the truclc wheels of a car, and in the mechanism for operating the said brake-shoes.

As illustrated in the drawings ,the truckframe consists of the wrought-iron side frames, A, and transverse transoms B. The latter may be made of any suitable material wrought to any shape that is suited to the purpose; but, preferably, I make them of wrought-iron rolled channel-beams, as shown in the drawings. Said transoms have their ends secured to the side frames, A, and are arranged parallel to each other between the truck-wheels O.

D and D are transverse rocker-shafts journaled in bearings d, secured to the outer faces of the transoms B. Each of said shafts has, at or near its middle, an arm, E, secured thereto for the purpose of receiving the levers F and F, which are respectively fulcrumed in the lower ends of the arms E to the shafts D and D. The lower ends of the levers F and F are connected together by a rod, f, so as to have a simultaneous motion. The upper end of the lever F is held by a stationary stud, f,which is adjustably attached to a bracket, G, secured to one of the transoms B, and the upper end of the lever F is connected by means of rods or chains f to any suitable brakeoperating mechanism.

To the outer ends of the shafts D and D pendent arms H are secured. Said arms have their lower ends pivoted, as at h, to brakeshoes I, whose concave faces are fitted to bear against the treads of the truck-wheel 0. Each of said brake-shoes is provided near its upper end with a horn, i, or other suitable attachment, for receiving the lower end of a safety-chain, J, and by means of said chains the brake-shoes I are suspended and held in such manner that while the brakes are released the curved surface of each shoe will be parallel to the curvature of the tread of the truck-wheels, but entirely clear therefrom, ready for instantaneous action, and the parts are so adjusted that the concave surface of each brake-shoe will bear equally in every part at the same instant whenever it is brought into contact with the tread of its allotted truckwheel. By this means the wear upon the face of the brake-shoe will be so even that they may be used until they are worn so thin that they will not possess sufficient strength for the purpose. In case of the disengagement of an arm,

H, from its attached brake-shoe, the latter will be held by its safety-chain J, and prevented from falling upon the track where it would possibly endanger the safety of the train.

By applying a drawing-strain to the rods f 2 by the brake-operating mechanism, the levers 7 5 F and F will be moved simultaneously, so as to throw the lower ends of the arms E outward, toward the axles of the truck-wheels 0, thereby imparting a sufficient rocking motion to the shafts D and D to press the brake-shoes I forcibly against the treads of their respective truck-wheels, and thus stop their rotatory motion.

WVhen preferred, the bearings ,d for the rocker-shafts maybe secured to any other 8 5 convenient part of the truck-frame-whether of wood or 'ironinstead of securing them to the transoms B, as shown in the drawings.

I am aware that it has been heretofore proposed to connect the brake-beam with the car- 0 truck frame by chains, for the purpose of preventing said beam, in case of detachment, from falling upon the track. I am not aware, however, that prior to my invention such chains have been used to connect the truck-frame with 9 5 the brake-shoes in such manner as to maintain constant parallelism between the brake-shoe concave and the car-wheel tread, as hereinafter claimed.

I claim as my invention- 1. In a car-brake, the rocker-shafts D and D, provided with arms E, carrying levers F and F, connected together as herein described, in combination with arms H, secured to the rocker-shafts D and D, and connected to the brake-shoes I, to operate as and for the purpose herein specified.

2. In a car-brake, the combination, with the I truck-frame, of the shafts D D, the pendent arms H,the brake-shoes I, pivoted to the lower ends of said arms, and the chains J, attached 10 to the truck-frame, and connected directly with the brake-shoes at points z above the pivotal connections of such shoes, whereby, when the brakes are released, the concave-surface of each shoe will be held parallel to the car-wheel tread, and ready for instantaneous 15 application.

' DAVID HOIT.

Vitnesses WILLIAM H. Low, S. B. BREWER. 

